Kconfig: improve KALLSYMS_ALL documentation

Dumb users like myself are not able to grasp from the existing KALLSYMS_ALL
documentation that this option is not what they need. Improve the help
message and make it clearer that KALLSYMS is enough in the majority of
use cases, and KALLSYMS_ALL should really be used very rarely.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>

diff --git a/init/Kconfig b/init/Kconfig
index 56240e7..563065d 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -968,12 +968,18 @@ config KALLSYMS_ALL
        bool "Include all symbols in kallsyms"
        depends on DEBUG_KERNEL && KALLSYMS
        help
-          Normally kallsyms only contains the symbols of functions, for nicer
-          OOPS messages.  Some debuggers can use kallsyms for other
-          symbols too: say Y here to include all symbols, if you need them 
-          and you don't care about adding 300k to the size of your kernel.
-
-          Say N.
+          Normally kallsyms only contains the symbols of functions for nicer
+          OOPS messages and backtraces (i.e., symbols from the text and inittext
+          sections). This is sufficient for most cases. And only in very rare
+          cases (e.g., when a debugger is used) all symbols are required (e.g.,
+          names of variables from the data sections, etc).
+
+          This option makes sure that all symbols are loaded into the kernel
+          image (i.e., symbols from all sections) in cost of increased kernel
+          size (depending on the kernel configuration, it may be 300KiB or
+          something like this).
+
+          Say N unless you really need all symbols.
 
 config KALLSYMS_EXTRA_PASS
        bool "Do an extra kallsyms pass"